66144467254 has 4 divisors (see below), whose sum is σ = 99216700884. Its totient is φ = 33072233626.

The previous prime is 66144467209. The next prime is 66144467261. The reversal of 66144467254 is 45276444166.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 66144467198 and 66144467207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16536116812 + ... + 16536116815.

It is an arithmetic number, because the mean of its divisors is an integer number (24804175221).

Almost surely, 2^66144467254 is an apocalyptic number.

66144467254 is a deficient number, since it is larger than the sum of its proper divisors (33072233630).

66144467254 is a wasteful number, since it uses less digits than its factorization.

66144467254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33072233629.

The product of its digits is 3870720, while the sum is 49.

The spelling of 66144467254 in words is "sixty-six billion, one hundred forty-four million, four hundred sixty-seven thousand, two hundred fifty-four".